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It was understood Swansea wanted at least £40million if they were to sell Sigurdsson, but that figure has now been revised with transfer fees spiralling this summer.

Sigurdsson has three years left on his contract having signed a new deal last August.

He has scored 30 goals in 112 games since the Swans signed him from Tottenham for £6.8m in July 2014.

Swansea chairman Huw Jenkins revealed in February that Sigurdsson was the subject of "substantial offers" during the last transfer window, with interest understood to have come from both home and abroad.

Sigurdsson said at the club's end-of-season awards in May that he was happy at Swansea and would only leave the Liberty Stadium if the club wanted to sell him.

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